Basis Of Presentation (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 08, 2018 USD ($) segment restaurant	Jul. 09, 2017 USD ($)	Jul. 08, 2018 USD ($) restaurant	Jul. 09, 2017 USD ($)	Apr. 16, 2017 restaurant
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	2,241		2,241		2,255
Number of reportable segments | segment	1
Contractual obligation			5.00%
Incremental Corporate Advertising Contributions	$ 1,500		$ 3,300
Marketing and advertising expense	5,900	$ 8,200	22,000	$ 29,300
Excess Tax Benefit from Share-based Compensation, Operating Activities	1,300		2,084	4,133
Net assets, adjusted balance	200		200
Net periodic benefit cost excluding service cost	$ 22	$ 500	$ 71	$ 1,600
Entity Operated Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	146		146		340
Franchised Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	2,095		2,095		1,915